Universal Parts 50mm QMB139 Non Emissions Head – 64mm Valves

Logo50cc QMB139 4-stroke 50mm, Non Emissions Cylinder Head with 64mm Valves for use with 81.3cc Big Bore Kit! (See Related Items)

*You may need to modify your engine case to accommodate the larger cylinder.

SKU: 151-265 Category:


  • For Use With 81.3cc Big Bore Kit
  • Valve Length: 64mm
  • Overall Height: 59.5mm
  • Intake Port Diameter: 18mm
  • Exhaust Port Diameter: 17mm
  • Intake Bolt Hole Spacing: 44.5mm
  • Exhaust Bolt Hole Spacing: 50mm

Additional information

Weight 2.35 lbs